C Sharp Window Form Refresh

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C#

C#4.0

how can I refresh a form from another.
I have made properties in the program.
  eg:

Main Form, Sub Form

H main opens Sub But I want the value of the sub to the display in Main without having to close and then re opened (Main_Load). through the properties I have made,
But at that time by one second to make renewal.

The Main has a TxtMain.
H Sub has 1 Textbox and a Button.

private void BtnSave_Click (object sender, EventArgs e)
         {
             Properties.Settings.Default ["Price"] = Convert.ToDouble (TxtSUB.Text);
             Properties.Settings.Default.Save ();
         }

 

So when you close the form OnClose () I want to get the property value and puts it in TxtMain.Text. with Main.Refresh () not my work.